Yekke, the author is Rabbi J. David Bleich (you can read the Wikipedia article on him yourself). In his article he quotes major poskim such as Rav Moshe. However, ain hachi nami, if he says “I want a pen for writing on Shabbat” you should not sell it to him unless he has a heter to write on Shabbat (e.g. he is a doctor). Howeevr, the mere fact that he is non-observant does not mean that he will use it b’issur. Maybe he will use another pen. Maybe before Shabbat comes in he will do teshuva.
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